NHTSA Owner Complaint Log
This page lists owner-reported complaints filed with NHTSA for the 2020 BMW 4 Series. Complaints are unverified consumer reports submitted to NHTSA and do not by themselves prove a defect or defect rate.
The contact owns a 2020 BMW 430I. The contact stated while driving 55 MPH, the low coolant warning light was illuminated, and the message "Engine Overheating" was displayed. The vehicle was parked at the place of employment. The coolant level was checked an hour later by the contact’s husband, and the coolant level was low. The contact stated that her husband added coolant to the reservoir and observed coolant leaking underneath the engine compartment. The contact stated that later in the day, while driving at an undisclosed speed and the failure reoccurred. The vehicle was taken to a dealer where it was diagnosed; however, the location of the leak was undetermined. The manufacturer was notified of the failure. The failure mileage was approximately 66,475.
I owned a 2020 BMW 430i (VIN: [XXX] ) manufactured in March 2019 at the Regensburg plant. This vehicle matches the exact criteria of NHTSA Recall 19V-352 for defective knee airbags that may fail to deploy in an accident. I was involved in a serious crash on [XXX], and the airbags did not deploy. Despite this, my VIN is not showing as included in the recall. I am submitting this as a potential VIN exclusion error that may have resulted in harm and needs urgent investigation. I have documentation of the vehicle's production date, model match, and accident details. I also suffered significant psychological trauma as a result of this failure, which escalated due to the lack of explanation at the time. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
The contact owns a 2020 BMW 430i. The contact stated while his wife was driving below 10 MPH and depressing on the brake pedal, the vehicle failed to stop as needed. The contact stated no warning light was illuminated. The driver parked the vehicle and then had the vehicle towed to the local dealer, where it was diagnosed with needing the brake booster replaced. The vehicle was repaired. The manufacturer had been informed of the failure. The failure mileage was approximately 86,000.
NHTSA source checks for this vehicle year
Checks are recorded separately for each dataset, not for the whole page. Dates use UTC. A missing check date does not mean no records exist.
Vehicle import recorded: Aug 30, 2026. This is the stored import date, not confirmation that every source was successfully refreshed.